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YD actr fault  msg. no. 22-21042  FDE: YD disenga  YD actr/ LVDT/wrg  LATCHED: YES  TYPE:  Possible Causes: . Rudder power control unit actuator solenoid . Rudder power control unit transfer valve . Rudder power control unit position transducer . Yaw damper coupler Troubleshooting: . Verify resistance: D295 socket 20 to ground is: 72 to 76  ohms (P/N 881600-1001)  49 to 80  ohms (P/N 45080)  79 to 115 ohms (P/N 45080-1)  D295 socket 30 to D295 socket 32 is 2K D295 socket 9 to D295 socket 1 is 100 ohms D295 socket 46 to D295 socket 47 is 80  ohms . Verify wiring at the rudder power control unit actuator solenoid: D295 socket 20 and D291 socket 1 D295 socket 30 and D291 socket 8 D295 socket 32 and D291 socket 5 D291 socket 7 and D291 socket 6 . Verify wiring at the rudder power control unit position transducer: D295 socket 46 and D291 socket 11 D295 socket 47 and D291 socket 12 D295 socket 9 and D291 socket 10 . Verify connection to ground at: D291 socket 2 at the rudder power control unit actuator solenoid D295 socket 1 D291 socket 9 at the rudder power control unit position transducer . Inspect electrical connectors for bent or broken pins, contamination, or damage. . If problem persists, replace rudder power control unit. . If problem persists, replace yaw damper coupler. 

22-12-01 Page 118  500 May 01/01 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

 

PR fault  msg. no. 22-21043   PR sol/ PR snsr  LATCHED: YES   TYPE:  Possible Causes: . Pressure reducer bypass valve . Yaw damper coupler Troubleshooting: . Verify that the rudder pressure reducer valve manual lever is in the normal position. . Verify resistance from D295 socket 31 to ground is 60 ohms. . Verify wiring between D295 socket 31 and D737 socket 1 at the pressure reducer bypass valve solenoid. . Verify connection to ground from D737 socket 2 at the pressure reducer bypass valve solenoid. . Verify wiring at the pressure reducer bypass valve: D295 socket 51 and D737 socket 3  D295 socket 52 and D737 socket 2 . Verify connection to ground from D737 socket 1 at the pressure reducer bypass valve. . Inspect electrical connectors for bent or broken pins, contamination, or damage. . If problem persists, replace the pressure reducer bypass valve. . If problem persists, replace yaw damper coupler. 

500 Sep 01/00  22-12-01 Page 119 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

YAW DAMPER COUPLER - REMOVAL/INSTALLATION
EFFECTIVITY
Aircraft with Yaw Damper Coupler P/N 4084042 (after SB 27A1206)
1. General

 

A.  The yaw damper coupler is retained in the electronic rack by cam-action levers which hook over forks on the shelf.
2.  Remove Coupler
A.  Open yaw damper AC and DC circuit breakers on P6 panel
CAUTION:  DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS OF THE YAW DAMPER. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE COUPLER.
B.  Release coupler by pressing triggers then pull ejection levers to release unit.
C.  Remove coupler.
3.  Install Coupler
A.  Place coupler in rack and simultaneously push ejection levers up until levers are latched (Ref 20-10-111).
B.  Close yaw damper circuit breakers.
4.  Installation Test
NOTE:  The following test must be completed to release the aircraft for further flight with the Yaw Damper Coupler active. A portion of the test configures the Yaw Damper Coupler to the airplane configuration.
A.  Prepare for the Yaw Damper Coupler test.
(1)  
Provide electrical power to the aircraft and energize load control center panels P6 and P18 (Ref 24-22-00).

(2)  
Energize hydraulic systems A and B and ensure FLT CONTROL A and FLT CONTROL B switches are positioned to ON (Ref 29-15-00).

(3)  
Ensure the following circuit breakers on load control center panels are closed (Reference 22-12-01/501, step 2.C for circuit breaker list.).

B.  Yaw Damper Configuration and System Tests
NOTE:  If no keypad entries are made for 5 minutes, the YDC BITE display will turn off. It will be necessary to start over if this occurs.
NOTE:  A fault message "LRRA 2 FAULT" is normal if No. 2 LRRA (Low Range Radio Altimeter) is not installed or powered.
(1)  
Press ON/OFF on the YDC BITE panel. Observe that ENTER BITE? Is displayed on the panel.

(2)  
Observe that PLEASE WAIT is temporarily displayed followed by EXISTING FAULTS? on the panel. Observe the AUTOPILOT DISENGAGE WARNING lights illuminate steadily.

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